To probe into the influences of low temperature stress on physiological index related to resistance to coldness in pepper,the changes of conductivity percentage,the activities of superoxede dismutase (SOD) and the malondialdelyole (MDA) contents were determined by using high resistance to coldness variety Xiangyan No.1,middle resistance to coldness variety Zaofeng No.1 and no resistance to coldness variety Xiangyan No.5.The results show that conductivity percentage,MDA contents and SOD activities under low temperature increase,but actinties of Xiangyan No.5 decrease.The changes of physiological index before and after the treatment show that the index are closely related to pepper's cold resistance ability.